Coco Gauff’s serving struggles returned to haunt the American during her opening loss at the WTA Finals to Jessica Pegula. Gauff, a champion in Riyadh 12 months ago, struggled mightily against Pegula, hitting 17 double-faults and 45 unforced errors off her forehand wing.

Coco Gauff’s ongoing issues with her serve were back in the spotlight after a three-set loss to Jessica Pegula at the WTA Finals. The American hit 17 double faults and finished the match with 75 unforced errors in her 3-6,

Tomorrow, the Stefanie Graf Group begins with the top-ranked Aryna Sabalenka facing the eighth-seeded Jasmine Paolini. After that, Gauff and Pegula face off in Sunday's finale. Sabalenka is 5-2 against Paolini, and Pegula is 4-3 against Gauff.

The sport’s fiercest women traded sweatbands for red carpet finesse, and fans can’t get enough of the off-court glow-up.